docs: def get_email_context(self,**kwargs):
          ''' Overrides EmailRecipientMixin '''
          context = super(Invoice,self).get_email_context(**kwargs)
          context.update({
              'id': self.id,
              'url': '%s?v=%s' % (self.url, self.validationString),
              'amountPaid': self.amountPaid,
              'outstandingBalance': self.outstandingBalance,
              'status': self.statusLabel,
              'creationDate': self.creationDate,
              'modifiedDate': self.modifiedDate,
              'paidOnline': self.paidOnline,
              'grossTotal': self.grossTotal,
              'total': self.total,
              'adjustments': self.adjustments,
              'taxes': self.taxes,
              'fees': self.fees,
              'comments': self.comments,
          })
          return context